/*
 * @(#)$Id$
 *
 * Copyright 2006-2008 Makoto YUI
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * Contributors:
 *     Makoto YUI - initial implementation
 */
package gridool.util.compress;

import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.Deflater;

/**
 * <DIV lang="en">
 * {@link java.util.zip.DeflaterOutputStream} does not call {@link Deflater#end()} on {@link #close()} when Deflater is specified on the constructor.
 * This causes memory leaking in non-heap.
 * </DIV>
 * <DIV lang="ja"></DIV>
 * 
 * @author Makoto YUI (yuin405@gmail.com)
 */
public final class DeflaterOutputStream extends java.util.zip.DeflaterOutputStream {

    /**
     * Indicates that the stream has been closed.
     */
    private boolean closed = false;

    public DeflaterOutputStream(OutputStream out) {
        super(out);
    }

    public DeflaterOutputStream(OutputStream out, Deflater def) {
        super(out, def);
    }

    public DeflaterOutputStream(OutputStream out, Deflater def, int size) {
        super(out, def, size);
    }

    /**
     * Writes remaining compressed data to the output stream and closes the
     * underlying stream.
     * @exception IOException if an I/O error has occurred
     */
    @Override
    public void close() throws IOException {
        if(!closed) {
            finish();
            def.end();
            out.close();
            closed = true;
        }
    }

}
